On BVAC .30 Carbine ammo I've inspected, made in Montana and likely by the same people as U.S.A Armscor and using the same "brass colored" bullets, the OAL was about 1.645" to 1.655". The cases were full of 15.0 grains (to the bullet line) of very fine ball powder, but not "flattened" like H-110.
To avoid a compressed charge, it wouldn't be a good idea to re-seat bullets to the SAAMI minimum without checking on what's inside. I'm probably "preaching to the choir" here, but just wanted to make sure everyone realizes how important that is. The last ones I reloaded with those bullets were set to about 1.645" and worked fine. Are the cases on those new Armscor loads somewhere around 1.284"-1.288" in length? Thanks! - Bob